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5201-erts-Fix-erlang-is_alive-0-to-not-call-net...
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File 5201-erts-Fix-erlang-is_alive-0-to-not-call-net_kernel.patch of Package erlang
From 7fd016388ba8facc563e74dc7b9792fafa244fe6 Mon Sep 17 00:00:00 2001 From: Sverker Eriksson <sverker@erlang.org> Date: Tue, 22 Feb 2022 13:09:57 +0100 Subject: [PATCH] erts: Fix erlang:is_alive/0 to not call net_kernel Module erlang is preloaded and not allowed to call non-preloaded modules like net_kernel. Have been seen to cause spinning beam.smp when piped STDIN and STDOUT. Bug introduced by c4d92b48e27aa8ed550d02e3511e2bc288847579 and included in OTP-25.0-rc1. --- erts/preloaded/ebin/erlang.beam | Bin 131440 -> 131496 bytes erts/preloaded/src/erlang.erl | 2 +- lib/kernel/src/net_kernel.erl | 4 ---- 3 files changed, 1 insertion(+), 5 deletions(-) diff --git a/erts/preloaded/src/erlang.erl b/erts/preloaded/src/erlang.erl index af6f1e1946..c2fe2a41c2 100644 --- a/erts/preloaded/src/erlang.erl +++ b/erts/preloaded/src/erlang.erl @@ -1276,7 +1276,7 @@ iolist_to_iovec(_IoListOrBinary) -> %% is_alive/0 -spec is_alive() -> boolean(). is_alive() -> - net_kernel:is_alive(). + erlang:whereis(net_kernel) =/= undefined. %% is_builtin/3 -spec erlang:is_builtin(Module, Function, Arity) -> boolean() when diff --git a/lib/kernel/src/net_kernel.erl b/lib/kernel/src/net_kernel.erl index 8d172dbccd..7b15e45912 100644 --- a/lib/kernel/src/net_kernel.erl +++ b/lib/kernel/src/net_kernel.erl @@ -70,7 +70,6 @@ nodename/0, protocol_childspecs/0, epmd_module/0, - is_alive/0, get_state/0, dist_listen/0]). @@ -192,9 +191,6 @@ longnames() -> request(longnames). nodename() -> request(nodename). -is_alive() -> - whereis(net_kernel) =/= undefined. - get_state() -> case whereis(net_kernel) of undefined -> -- 2.34.1
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